Dear Riet,
Thank you so much for this very helpful information – that’s just wonderful 😊
Related to your questions and from my own practical experience (non
lab-standard):
In my cases beetles have “come out” within the treatment – not afterwards.
I am storing the objects in a controllable environment as well (after the
treatment), which can be a bag, an area surrounded by a tape, a quarantine-room
etc. – just to be sure.
If the question upon the “controllable” storage-time might come up:
a) For untreated wooden items from abroad I prefer at least two years. This
relates to the different climate/vegetation zones and therefore the possibly
changing (prolonging) development/life-cycles.
(E.g. I took some larvae from Egypt to Germany and feed them so that an
imago can be identified by an entomologist… After 4 years they still haven’t
pupated.)
b) For untreated wooden items from Germany (= the same climate/vegetation zone)
I prefer at least one year – if this is possible due to the object size,
forthcoming exhibitions etc., of cause.
c) For treated wooden items I prefer a half a year – if it is possible.
Maybe some other pest-listers have some other experiences and preferences?
@ Stephan Biebl: What are your experiences?
Best wishes
Antje
A. Zygalski Conservation Co.
Object- and Art-Technical Investigations of Ancient and Historic Wooden Objects
Remedial Conservation • Restoration of Ancient and Historic Wooden Objects
Woodworking in Ancient, Historic and Modern Techniques
Preventive Conservation
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Von: 'Riet De Coninck' via MuseumPests <pestlist@googlegroups.com>
Gesendet: Donnerstag, 9. Januar 2025 12:13
An: pestlist@googlegroups.com
Betreff: Re: [PestList] WG: Lyctus sp.
Hello everyone,
Some pictures of the lyctus sp for those who didn't see them yet.
They were collected from the package of a mexican mask after freezing the
object (and under the mask before freezing but I dont have a sample of those).
Did they come out in the package during freezing or after? I don't know but we
advices to keep the mask quarantained in a bag for a while to be sure the
infestation is not active anymore.
I got some more information on the mask as well: it was bought in Mexico
november 2023 and came in the collection in Antwerp, Belgium 11 april 2024. We
did a conditioncheck in the qaurantineroom on 14 of april and noticed some
exit hole with sharp edges. We adviced a freezing treatment but it wasn't
carried out right away. After a couple of month's there was a cleanup day in
the quarantineroom and dead insects were found under the mask. Togehter with
some other objects with wood who where in the same room, the mask got his
freezing treatment. While unpacking after freezing, we found 4 death beetles.
Being such a short time in europe, the Lyctus sp. would be a south american sp?
like Lyctus Caribeanus maybe?
Thank you all for the information this group and all the posts provides! I
learn a great deal from them.
kind regards,
Riet
Riet De Coninck | Deskundige Restauratie / Preventieve Conservatie
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_____
Van: 'Anderson, Gretchen' via MuseumPests <pestlist@googlegroups.com
<mailto:pestlist@googlegroups.com> >
Verzonden: maandag 30 december 2024 22:32
Aan: pestlist@googlegroups.com <pestlist@googlegroups.com
<mailto:pestlist@googlegroups.com> >
Onderwerp: Re: [PestList] WG: Lyctus sp.
WAARSCHUWING: DIT IS EEN EXTERNE MAIL
Deze mail komt van buiten onze organisatie. Kijk eerst of je het mailadres en
de afzender herkent en/of vertrouwt. Doe dat voor je bijlagen opent of links
aanklikt. Zo houden we onze organisatie veiliger voor phishing.
Dear Antje,
I think the lack of response might simply have been the result of the holiday
season. Unfortunately, I did not see any of this discussion and cannot find it
in my email history. I would be very interested to see the photographs, if any
were sent.
Wood boring beetles and termites are very much an interest to this group. Like
you, I have seen many objects damaged by wood boring insects over the years.
Most recently was a collection of framed artwork that came in on loan that had
an incredible infestation of termites. Since it was a loan from out of the
country, we were able to deal with it through anoxic treatment and a thorough
cleaning. I have also dealt with numerous masks that had old, no longer active
infestations, as well as various problems in historic houses. In some of these
cases, treatment has caused further damage. This leads to a number of point of
interest and questions.
* How to identify an active infestation from an inactive infestation? (If
the infestation is old and no longer active, then treatment should be minimal
since treatment could cause additional and unnecessary damage.)
* How to identify the culprit?
* Was the damage done while the wood was alive or dead? (Beetles that
attack live wood are not a threat to our collections, yet the evidence is often
seen and can be thought to be active so the object is treated, often to its
detriment.)
* What are the best treatments available?
* What are the best ways to monitor?
These (and other) questions need to be answered whenever you think you find
potentially infested wood. This comes back to the point of isolation and
monitoring to determine if the infestation is active or not.
Please continue to post this kind of information and discussion. That is
exactly what the PestList is here for.
Happy New Year
Gretchen
Gretchen Anderson (she, her)
Conservator
Carnegie Museum of Natural History
<mailto:anders...@carnegiemnh.org> anders...@carnegiemnh.org
Instructor
Preventive Conservation, IPM, Museum Housekeeping
Museum Study LLC
<https://www.museumstudy.com/> Museum Study online professional development -
Home
_____
From: 'Antje' via MuseumPests <pestlist@googlegroups.com
<mailto:pestlist@googlegroups.com> >
Sent: Tuesday, December 17, 2024 2:36 AM
To: pestlist@googlegroups.com <mailto:pestlist@googlegroups.com>
<pestlist@googlegroups.com <mailto:pestlist@googlegroups.com> >
Subject: [PestList] WG: Lyctus sp.
CAUTION: This email originated from outside of the organization. Do not click
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Dear PestListers,
as there were no answers to the mails of Riet, Ashley and mine regarding the
topic of Lyctus sp.
I am interpreting that wood boring insects are not of interest in this group.
And as I don’t want to bother people with mails and files,
I will not send the photographs to the complete group.
If someone is interested - please get in touch off-list. 😊
Best wishes
Antje
A. Zygalski Conservation Co.
Object- and Art-Technical Investigations of Ancient and Historic Wooden Objects
Remedial Conservation • Restoration of Ancient and Historic Wooden Objects
Woodworking in Ancient, Historic and Modern Techniques
Preventive Conservation
Terminology work
(Consulting, Research, Implementation, Lectures and Workshops)
Web:
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Von: Antje <a.zygal...@googlemail.com <mailto:a.zygal...@googlemail.com> >
Gesendet: Freitag, 29. November 2024 14:59
An: pestlist@googlegroups.com <mailto:pestlist@googlegroups.com>
Betreff: Lyctus sp.
Dear Riet,
Dear Ashley,
Apart from the somehow strange coincidence that two cases of a Lyctus
infestation are reported just within a week 😊 -
may I address some questions to your cases?
Do you have the possibility to provide us with a photograph of each object and
a picture of the damage?
And Riet, do you have any information upon the place of production or when the
mask entered your collection?
I had a similar case last year with a private costumer’s picture frame.
(I am attaching for the moment a photograph of the picture in its old frame.)
Treatment:
The infestation was so intense that the frame had to be discarded / the picture
had to be reframed.
Timber age and place of frame-production:
As I remember the infested frame was not that old and was most probably
produced in Germany / bought from a German frame-maker.
(I will get in contact with the customer again and try to figure out the
details.)
Upon the wood species (as Stephan pointed to this):
(I am not a botanist (and therefore not able to differentiate between all
approx.. 60.000 wood species in the world)
but I am a cabinetmaker and as wooden objects conservator have been trained in
the Munich Wood Research Institute by Dr. Grosser
for identifying the approx.. 100 wood species found in middle-European
furniture = middle-European species and species from colonial areas).
What I can say based on this education is the following.
related to the frame context:
* It has to be a modern commercial wood species (EN 13566)
related to a macroscopic investigation (colour, density, wood texture, fungal
decay type …):
* it is a hardwood species
* obviously not middle-European origin
* most probably: Triplochiton scleroxylon (“Abachi” in german)
(Attention: there was no micro-anatomical identification carried out!)
Damage:
As the customer was so kind to send me a part of the old frame I will prepare
some photographs at the weekend and send them next week.
Beetle species:
It was not a topic to identify the species as it was clear that the frame will
be replaced.
But I have collected an adult and will make some photographs at the weekend as
well.
This might be a Lyctus sp. as well.
Best wishes
Antje
A. Zygalski Conservation Co.
Object- and Art-Technical Investigations of Ancient and Historic Wooden Objects
Remedial Conservation • Restoration of Ancient and Historic Wooden Objects
Woodworking in Ancient, Historic and Modern Techniques
Preventive Conservation
Terminology work
(Consulting, Research, Implementation, Lectures and Workshops)
Web:
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